中文摘要：

通过构建模型考察劳动收入份额变化与技术进步偏向性关系,模型显示：（1）劳动收入份额与技术进步作用表现出双向性,技术进步偏向性和要素组合模式决定要素收入分配结构,而技术进步偏向性更是通过要素产出弹性强化对收入分配结构作用,即纯技术进步偏向性对要素收入分配结构变化影响有限,而且技术进步偏向性与要素收入呈现相依性和非线性共变特征。（2）劳动收入份额对技术进步偏向性方向的影响并非固定,而是存在临界效应,当劳动收入占比达到这一临界时,企业对技术进步偏向性选择无差异。若劳动收入占比小于或大于这一临界值时,企业对技术进步偏向性的选择将向两个相反方向发展。

英文摘要：

The paper develops a simple model to give some explanation of the labor share in national incomes and technical change direction.The models show that：（1） The function of the labor share and technical change direction is mutual.The labor share is determined by technical change direction and the form of the production function-how the capital and the labor combined with each other with the current state of technology.Namely,biased technical change strengthens its effect on labor share via factor production elasticity,and if there exists only biased technical change where its contribution to the labor share is limited,and the relationship between both of them grows to be dependent and nonlinear.（2） The effect of the labor share on technical change direction turns out to be fluctuant and there exists some threshold effect.When the labor share equals certain critical value,there is no difference to choose no matter what biased technical change.But if the labor share is above it,the firm is willing to use capital biased technical change,and vice versa.